/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraNodeWithDynamicPins.h
Request a new pin.
void AddParameter ( [FNiagaraVariable](API\Plugins\Niagara\FNiagaraVariable) Parameter, [TEnumAsByte](API\Runtime\Core\Containers\TEnumAsByte)< EEdGraphPinDirection > Direction )